<template>
    <div class="xtx-cart-page">
      <div class="container">
        <XtxBread>
          <XtxBreadItem to="/">首页</XtxBreadItem>
          <XtxBreadItem>购物车</XtxBreadItem>
        </XtxBread>
        <div class="cart">
          <table>
            <thead>
              <tr>
                <th width="120"><XtxCheckbox v-model="isAll">全选</XtxCheckbox></th>
                <th width="400">商品信息</th>
                <th width="220">单价</th>
                <th width="180">数量</th>
                <th width="180">小计</th>
                <th width="140">操作</th>
              </tr>
            </thead>
            <!-- 有效商品 -->
            <tbody>
              <tr v-for="item in effectiveCartList" :key="item.id">
                <!-- 复选框 -->
                <td><XtxCheckbox
                    :modelValue="item.selected"
                    @change="(selected)=>handleCartSelected(item.skuId,selected)"
                     /></td>
                <td>
                  <div class="goods">
                    <RouterLink to="/"><img :src="item.picture" alt=""></RouterLink>
                    <div>
                      <p class="name ellipsis">{{item.name}}</p>
                      <p class="attr">{{item.attrsText}}</p>
                    </div>
                  </div>
                </td>
                <td class="tc">
                    <!-- 转换成数字类型 -->
                  <p>&yen;{{(+item.nowPrice).toFixed(2)}}</p>
                  <p v-if="item.price>item.nowPrice">比加入时降价
                    <span class="red">&yen;{{(+item.price-item.nowPrice).toFixed(2)}}</span>
                  </p>
                </td>
                <td class="tc">
                    <!-- 注意事项：
                        当vuex遇到了v-model指令要怎么处理：
                        1.不能直接把state中的数据绑在v-model上(因为v-model是双向绑定的
                        会直接修改state中的数据，但是在vuex中state的修改必须通过mutation,
                        这样就违背了vuex的理念
                        2.正确的方式
                        vue3中v-model的原理就是给所在标签（或组件）传递
                        modelValue
                        )

                     -->
                 <!-- 计数 -->
                     <XtxNumbox
                   :showLabel="false"
                   :modelValue="item.count"
                   :max="item.stock"
                   @update:modelValue='(count)=>handleUpdateCartCount(item.skuId,count)'
                   />
                   <!-- 同时获取两个参数
                    接收到组件中的count
                 -->
                </td>
                <td class="tc"><p class="f16 red">&yen;{{(item.nowPrice*item.count).toFixed(2)}}</p></td>
                <td class="tc">
                  <p><a href="javascript:;">移入收藏夹</a></p>
                  <p><a class="green" href="javascript:;" @click="$store.dispatch('car/delCartAction',item.skuId)">删除</a></p>
                  <p><a href="javascript:;">找相似</a></p>
                </td>
              </tr>
            </tbody>
            <!-- 无效商品 -->
            <tbody v-if="noneffectiveCartList.length">
              <tr><td colspan="6"><h3 class="tit">失效商品</h3></td></tr>
              <tr v-for="item  in noneffectiveCartList" :key="item.id">
                <td></td>
                <td>
                  <div class="goods">
                    <RouterLink to="/"><img :src="item.picture" alt=""></RouterLink>
                    <div>
                      <p class="name ellipsis">{{item.name}}</p>
                      <p class="attr">{{item.attrsText}}</p>
                    </div>
                  </div>
                </td>
                <td class="tc"><p>&yen;{{item.nowPrice}}</p></td>
                <td class="tc">{{item.count}}</td>
                <td class="tc"><p>&yen;{{(+item.nowPrice*item.count)}}</p></td>
                <td class="tc">
                  <p><a class="green" href="javascript:;" @click="$store.dispatch('car/delCartAction',item.skuId)">删除</a></p>
                  <p><a href="javascript:;">找相似</a></p>
                </td>
              </tr>
            </tbody>
          </table>
        </div>
        <!-- 操作栏 -->
        <div class="action">
          <div class="batch"></div>
          <div class="total">
            共 {{effectiveCount}} 件有效商品，
            已选择 {{allSelectedTotalCount}} 件，商品合计：
            <span class="red">¥{{allSelectedTotalAmount.toFixed(2)}}</span>
            <XtxButton type="primary">下单结算</XtxButton>
          </div>
        </div>
      </div>
    </div>
  </template>
<script>
import { computed } from 'vue'
import { useStore } from 'vuex'
export default {
  name: 'XtxCartPage',
  setup () {
    const store = useStore()
    // 有效购物车商品列表
    const effectiveCartList = computed(() => {
      return store.getters['car/effectiveCartList']
    })
    // 无效购物车列表
    const noneffectiveCartList = computed(() => {
      return store.getters['car/noneffectiveCartList']
    })
    // 更新指定商品数量
    const handleUpdateCartCount = (skuId, count) => {
      // 发起更新指定商品数量Action
      store.dispatch('car/updateCartCountAction', { skuId, count })
    }
    // 更新指定商品的选中状态
    const handleCartSelected = (skuId, selected) => {
      // 发起更新指定商品的选中状态Action
      store.dispatch('car/updateCartSelectedAction', { skuId, selected })
    }
    // 选中的有效商品总数量
    const effectiveCount = computed(() => {
      return store.getters['car/effectiveCount']
    })
    // 计算出有效的购物车列表中选中的商品总数
    const allSelectedTotalCount = computed(() => {
      return store.getters['car/allSelectedTotalCount']
    })
    // 计算出有效的购物车列表中选中的商品总数
    const allSelectedTotalAmount = computed(() => {
      return store.getters['car/allSelectedTotalAmount']
    })
    // 实现全选复选框的选中与切换动作
    const isAll = computed({
      get () {
        return store.getters['car/isAllSelected']
      },
      set (selected) {
        store.dispatch('car/toggleAllCartListAction', selected)
      }
    })

    return {
      effectiveCartList,
      handleUpdateCartCount,
      handleCartSelected,
      noneffectiveCartList,
      effectiveCount,
      allSelectedTotalCount,
      allSelectedTotalAmount,
      isAll
    }
  }
}
</script>
  <style scoped lang="less">
  .tc {
    text-align: center;
    .xtx-numbox {
      margin: 0 auto;
      width: 120px;
    }
  }
  .red {
    color: @priceColor;
  }
  .green {
    color: @xtxColor
  }
  .f16 {
    font-size: 16px;
  }
  .goods {
    display: flex;
    align-items: center;
    img {
      width: 100px;
      height: 100px;
    }
    > div {
      width: 280px;
      font-size: 16px;
      padding-left: 10px;
      .attr {
        font-size: 14px;
        color: #999;
      }
    }
  }
  .action {
    display: flex;
    background: #fff;
    margin-top: 20px;
    height: 80px;
    align-items: center;
    font-size: 16px;
    justify-content: space-between;
    padding: 0 30px;
    .xtx-checkbox {
      color: #999;
    }
    .batch {
      a {
        margin-left: 20px;
      }
    }
    .red {
      font-size: 18px;
      margin-right: 20px;
      font-weight: bold;
    }
  }
  .tit {
    color: #666;
    font-size: 16px;
    font-weight: normal;
    line-height: 50px;
  }
  .xtx-cart-page {
    .cart {
      background: #fff;
      color: #666;
      table {
        border-spacing: 0;
        border-collapse: collapse;
        line-height: 24px;
        th,td{
          padding: 10px;
          border-bottom: 1px solid #f5f5f5;
          &:first-child {
            text-align: left;
            padding-left: 30px;
            color: #999;
          }
        }
        th {
          font-size: 16px;
          font-weight: normal;
          line-height: 50px;
        }
      }
    }
  }
  </style>
